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/* pbmtoybm.c - read a pbm and write a file for Bennet Yee's 'xbm' and 'face'
** programs.
**
** Written by Jamie Zawinski based on code (C) 1988 by Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
#include <stdio.h>
#include "pbm.h"
#define YBM_MAGIC ( ( '!' << 8 ) | '!' )
static void putinit ARGS(( int cols, int rows ));
static void putbit ARGS(( bit b ));
static void putrest ARGS(( void ));
static void putitem ARGS(( void ));
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
bit* bitrow;
register bit* bP;
int rows, cols, format, padright, row, col;
pbm_init( &argc, argv );
if ( argc > 2 )
pm_usage( "[pbmfile]" );
if ( argc == 2 )
ifp = pm_openr( argv[1] );
else
ifp = stdin;
pbm_readpbminit( ifp, &cols, &rows, &format );
bitrow = pbm_allocrow( cols );
/* Compute padding to round cols up to the nearest multiple of 16. */
padright = ( ( cols + 15 ) / 16 ) * 16 - cols;
putinit( cols, rows );
for ( row = 0; row < rows; ++row )
{
pbm_readpbmrow( ifp, bitrow, cols, format );
for ( col = 0, bP = bitrow; col < cols; ++col, ++bP )
putbit( *bP );
for ( col = 0; col < padright; ++col )
putbit( 0 );
}
if ( ifp != stdin )
fclose( ifp );
putrest( );
exit( 0 );
}
static long item;
static int bitsperitem, bitshift;
static void
putinit( cols, rows )
int cols, rows;
{
pm_writebigshort( stdout, YBM_MAGIC );
pm_writebigshort( stdout, cols );
pm_writebigshort( stdout, rows );
item = 0;
bitsperitem = 0;
bitshift = 0;
}
static void
putbit( bit b )
{
if ( bitsperitem == 16 )
putitem( );
++bitsperitem;
if ( b == PBM_BLACK )
item += 1 << bitshift;
++bitshift;
}
static void
putrest( )
{
if ( bitsperitem > 0 )
putitem( );
}
static void
putitem( )
{
pm_writebigshort( stdout, item );
item = 0;
bitsperitem = 0;
bitshift = 0;
}
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